Soot-blowing provision



INVENTOR ATTORNEY March 30 Q 1926.

. Y J. E. BELL SOOT BLOWING PROVISION Filed Sept. 17. 1925 KQ/ J1 Patented Mar. 30, 1926.

UNITED" STATES PATENT OFFICE.

JOHN E. BELL, OF BROOKLYN, NEW YORK, ASSIGNOR TO POWER SPECIALTY COMPANY,

I OF NEW YORK, N. Y. A CORPORATION OF NEW YORK.

SOOT-BLOWING PROVISION.

Application filed September 17, 1923. Serial No. 663,108.

To all whom it may concern:

Be it known that I, JOHN E.- BELL, a citizen of the United States, and resident of Brooklyn, in the county of Kings andState of. New York, have invented certain new and useful Improvements in Soot-Blowing absorbing heat therefrom wholly or largely by radiation as distinguished from contact with, andconduction from the heating gases .in the chamber. Such apparatus is well adapted for use in superheating steam,

cracking oil and other purposes.

The main object of my invention is to provide apparatus of the type referred to with soot blowing provisions i. e. provisions for blowing soot and ashes or other furnace dust from the heat absorbing faces of the apparatus. In accordance with the present invention I provide apiparatus of the character described with e ective soot blowing provisions by enlarging a portion of the tube receiving passage in one or more of the casing sections between the ends of the section so that when the-corresponding tube is inserted in each such section, the enlargement forms a circular channel about the tube. A suitable'cleani'ng fluid as compressed air or steam is supplied to each such channel as by means of a suitable pipe connection to the side of the casing section remote from the furnace chamber, and this fluid is discharged through an opening formed in the casing sectionand leading from the channel to the face of the section exposed to. the furnace chamber, suitable discharge nozzle provisions being made for causing the heating fluid to be discharged in jets sweeping over the heat absorbing face of the wall formed by the casing section.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification. For a better understanding of the invention' however, its advantages and specific objects attained with its use reference should be had to the accompanying drawings and descriptive matter in which I have illus trated and described preferred embodiments of my invention.

Of the drawings:

Fig. 1 is a diagrammatic sectional elevation of a boiler furnace; i

Fig. 2 is an elevation of a portion of the furnace chamber Wall of Fig. 1, in which asuperheater is incorporated: i

Fig. 3 is a partial section on the line 3-3 of Fig. 2; f

Fig. 4 is a partial sec-tion on the line 44 of Fig. 3; and

Fig. 5 is a View taken similarly to Fig. 4 illustrating a modification.

In the drawings, A represents a boiler furnace having a Water-tube boiler A of conventional design mounted above a furnace chamber A Incorporated in one of the walls of the furnace chamber is a radi-. ant heat superheater B- comprising a row of parallel tubes. b having .outturned ends connected to the superheater inlet and outlet headers. B and B, respectively. The tubes 6 which are formed of wrou'ght iron or steel, are encased in block-like sections Z) heater and carried by the corresponding tube casing sections 7). As shown in Fig. 1,

2, and 3, the nozzle members C are removable parts screwed into threaded openings D formed in the corresponding casing sections 6. Each opening D" communicates at its inner end with a circular channel I) formed in the corresponding casin'g section b about the tube 6 passing through their casing section. Cleaning fluid as compressed air or steam, and preferablythe latter,- is supplied to each channel D through a corresponding opening D leading to the rear lUO face of the section and connected through .suitable'branch pipes E from pipes E connected by valves E to a cleaning fluid suply pipe E at the outer sideof the supereater.

Inthe'practical construction of the type of heat absorbing apparatus disclosed, it is necessary to bore or reamout the channels i in the casing sections 1) in which the tubes 6- are received to insure a sufliciently close fit, the casing sections 6 being'ordinarily fjoints between the device and the casings; When a casing section b to be P I'OVIdGCl or reamed out, it isa simple and re atively inexpensive matter to form a channel -D shrunk onto the tubes 6 thus insuring tight with soot blowing provisions, is bein bored therein with a suitable milling cutter or reaming tool, and this mode of forming the channels D is the one which I now consider preferable-from a practical standpoint, although it is possible in some cases to form the channels D in-castingthe casing section b'] .providedwith'such channels. Each nozzle C is provided with discharge orifices C arrangedl'to dischargethe cleaning fluid in fets sweepingover the heat absorbing faces of" the sections D: As shown each'nozzle G is' formed with 'a plurality of radially extending discharge orificesC. The soot blowing provisions above described are simple and effective and" relativelyinexpensivc.v With the tubes 6 forming the inner wall of the channels. D, the latter may be made of ample cross section without objectionably weakening the sections b" or seriously impairing their heat conducting i properties,

In lieu of employing removable nozzles C, tube casing sectlons I) provided with soot blowing provisions comprising integral nozzle lugs b on their heat absorbing faces,

' may be employed as shown in Fig. '5.

In this case the OPOnll'lQS D' and'D may be drilled at the same operation from the rear side of the casing section. and the discharge orifices holes I) are then drilled into the nozzle lug b. The construction shown in Fig. 5 is somewhat simpler than that shown in Figs. 2, 3, and 4, but the use of the removable nozzle parts C shown in the first described construction permits ready renewal of the nozzle parts in case of deterioration of the latter under the severe conditions to which they are exposed. The invention disclosed and claimed herein is a specific improvement on the inwention disclosed and generically claimed in my prior application, Serial No. 634,712, 'filed April While in accordance with thevprovlsions of the statutes I have illustrated and described the best forms of my invention now known to me, it will be apparent to those skilled in the art that changes in the'form of the apparatus disclosed may be made .vvithoutdeparting from the spirit of my invention as set forth in the appended claims. Having now described my invention, what I claim as new and desire to obtain by Letters Patent is; I

1. In-a fluid heating apparatus comprising parallel tubes encased by metal sections uniting to form a wall-like structure having a smooth heat absorbing face, the improverment which consists in enlargements of the tube receiving passages of some of said sections, whereby each such enlargementforms a channel in the correspondin section about the tube passing ,through t at section,- connections for supplying cleaning fluid to said channels, and nozzle provisions connected to. said channels for discharging the cleaning fluid over the heat absorbing surface of the apparatus. Y

. 2; In a radiant heat absorbing superheater comprising parallel tubes enclosed in metal sections uniting to form a wall-likestruc 'ture having a smooth heat absorbing face,

the improvement which consists in enlarge ments of the tube receiving passages ofsome of said sections whereby each such enlargement forms a circular channel in the corresponding section about the tube passing through that section, connections for supplying cleaning fluid to said channels and nozzle provisions connected to said channels for discharging cleaning fluid over said face. I

3. Fluid heating apparatus comprising a tube and a metallic casing block having a passage 111 which the tube is snugly received at the ends of the block and which is enlarged between the ends of the block to pro- JOHN E. BELL. 

